Apparatus for concentrating sulfuric acid.



No. 65|,7I7. Patented June l2, |900.

` .|.L.| |:s's|.en. APPARATUS FUR GONOENTRATING SULFURIC ACID.

(Application led Jan. 4, 1899,)

l(No Model.) 2 Sheets-Sheet Patented lune I2, |900.

J. L. KESSLER.`

APPARATUS FOR CONCENTRATING SULFURIG ACID.

(Application led Jan. 4@ 1899.) {,No Modal.) 2 Sheets-Sheet 2.

lllllll" y/ mm-WPME WITNESSES UNITED' STATES 'PATENT OFFICF..

JACQUES LoUIs KESsLER, oF CLERMONT-FERRAND, FRANCE.

`APPARA'i-us `Fon coNol-:pNpTRATINc sULFURiC ACID.`

SPECIFICATION forming part of Letters Patent No. 651,717, dated June 1a, 1900.

' Application inea January 4,1899. seriaino. 701,133. (No model.)

T0 all whom it may concern,.-

Be it known that I, JACQUES LoUIS Knssi LER, a citizen of the Republic of France, residing in Clermont-Ferrand, Puy-de-Dme, France, have invented an Improved Apparatus for Concentrating Sulf uric Acid, of which the following is a specication.

This invention relates to an improved apparatus for concentrating sulfuric acid by contact with heated gases.

The invention is more especially an improvement upon the apparatus for which I obtained Letters Patent No. 520,994, dated June 5, 1894.

The construction of thisV improved apparatus is such that the cleaning of the saturatingchamber and of the plates of the recoverycolumn is facilitated, that the said plates are of a simpler construction and insure a more convenient maintenance, and that consequently it is possible to treat in the said apparatus sulfuric acid containing impurities,

such as the acid obtained from Glovers ap-l paratus and that obtained by reusing the residues from the acids of nitration of organic acids. i

In the accompanying drawings, Figure lis a vertical section through the concentrating apparatus constructed in conformity with my invention,taken on the line l l of Fig. 2. Fig. 2 is a horizontal section through the said apparatus on the line 2 2 of Fig. `1. Fig. 3 isa cross-section on the line 3 3 of Fig. 2. Fig. 4 is a plan of one of the plates of this apparatus. Figs. 5 and 6 are sections taken, respectively, on the lines 5 5 and 6 6 of Fig. 4. Fig. 7 is a plan of another form of plate device calpable of being employed inthe apparatus.

Figs. 8, 9, and 10 are sections taken, respectively,0n the lines S 8, 9 9, and l0 l0 of Fig. 7.

The concentrating apparatus represented in Figs. l, 2, and 3 comprises, like my previous apparatus, a saturating-chamber A, receiving the acid to be concentrated and being subdivided in a number of channels @,through which the hot gases serving to produce the concentration circulate. These gases enter by Way of the flue B and the conduits b, pass chimney E after having traversed a range of lsuperposed perforated plates F. These plates receive the sulfuric acid prior to its introduction into the saturating-chamber A and deprive the gases of the greater part of their heat before they leave the apparatus through ,the chimney E. The chamber A and the collumn of plates are inclosed in a leaden jacket,

moistened with a solution of an alkaline sili l cate of 20o or 30 Baume, then dried and even more or less calcined, Whereas up to the present time they were formed of cut or chiseled stone. Silicious sand or pulverized glass or crystal or a mixture of these dierent materials may be used in place of puniice. The longitudinal channels formed by these partitions C-that is to say, the channels a,through which the gases pass, as Well as the conduits ct', leading to the chamber D-have their ends provided with openings, which are respectively closed by stopper-s or plugs b, of refractory stone. place'are cemented with clay. When they are removed, it is possible to introduce into the channels a ct' suitable tools to detach deposits of any nature that may have formed and that will obstruct said channels. At one of the ends of the chamber A a transverse gutter d is arranged, terminating in lateral openings d', each leading into a leaden conduit e, 'closed by a leaden plate e', secured, by means of iron caps, to the ange of the said conduit. These lateral openings may be simply closed with plugs of stone, which :resist the action of acid; but in this case it is preferable that the said plugs be externally covered With a leaden plate soldered onto the leaden jacket of the chamber in order to These plugs when put in TOO through the said channels a, act upon the surface of the acid, escape below the partitions C through the conduits a. into the chamber D, and escape from the apparatus by Way of the avoid any onance of escape.

The detached deposits above referred to are collected in the gutter d in order to be removed, by means of a scraper or rake, through is employedby means of Water -or a weakacid', with which the chamber A is' Yfilled up,`

to its overflow-level;

Itshould be understood that the openings in question may be provided upon one side only l or may be alternating from one side to another insteadof being formed upon opposite 1 faces, as represented.

When cleaned, the apparatus is recharged and again started. It is preferable that dur-' ing the operation an acid layer of about ten,A

to fifteen centimeters in height be maintained instead of a layer of only from five to eight centimeters, as has heretofore been the case. Under these conditions the salines of sulfateV ofiron and of sulfate of alumina, which constitute the greater part of the deposits which are formed in this layer, have time to become granular and to swell. They are then carried away to a lesser degree, and owing to their immediate precipitation they leave an acid clear and non-turbid.

slabs with annular anges, in which lateral openings are provided, closed by the aid of` lplugs g, of inattackable stone, which may be" covered by small plates of lead soldered .to

the leaden outer jacket of the plates; vThe openings in question serve to facilitate the` cleaning of the plates and the` replacing of their inner pieces.

of porcelain h, forming atonce an overfiow and a hydraulic seal.

In the device represented in Figs. '7 to lO the porcelain pieces z' of the device represented in Figs. 4 to 6 are completely omitted..

These pieces z' are replaced in this case .by a

particular shape imparted to lthe plates F.v These plates'are here so cut at their upper parts as vto present an annular flangej. and for each of the holes for the passage of the gases a sloping flange k. At theirlower part cavi-v The plates each comprise for the discharge of the acids a siphonal piece y l scribed.

flanged passage-holes vmay be combined with turned-back porcelainY caps or pans arid that in this case the cavities provided higher up would be omitted. In like manner the holes with flanges may be furnished with porcelain for the purpose of guarding against rupture of the cut iianges. The plates in the device are likewise provided with eleaningeopenings, closed by plugs g', and a sight-hole h', likewise closed by a stone plug. The apparatus improved in all its parts in the manner stated is then more suitable for concentrating sulfuric acids` containing impurities of anature such as to cause deposits during the operation, more especially of acids obtained from Glovers apparatus and of those produced by thel reemployment of residues resulting from acids of nitration or organic substances.

YI claim asmy invention l. `An improved apparatus for concentrating sulfuric acid and comprising inlet-conduits for the gas, a chamber Ahaving dividing-partitions C forming longitudinal channels communicating with each other under Ythe dividing-partitions, and provided with ,e joutlets for the gas and removable plugs at The plates F of the apparatus are formed, as represented on Figs. l, 3, 4, 5, and 6, of p the ends of each of the aforesaid channels, as

`and for the purpose described.

1212. An improved apparatus for concentratingsulfuric acid and comprising inlet-condults for the gas, a chamberAhaving dividing-partitions C forming longitudinal channels communicating with each other under the dividing-partitions, and provided with outlets for the gas, removable plugs at the ends of each of the aforesaid channels, a transverse gutter in the bottom of the chamber and a discharge-opening from the gutter, substantially as described.v

3. 'Animproved apparatus forconceutrating sulfuric acid, and compris-ing a saturatin-gchamber with superposed recovery-column consisting ot a series of perforated plates, having iianges with openings'closedfby removablel plugs, as and for the pizxrposepde- In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses- JACQUES LOUIS KESSLER.

Witnesses:

Pintor, JUAN LUCIEN, Lisrrrms, FANcrsQun ARMET EMILE.

ICO 

